public class Main {
    public static void change(String s) {
        s = "666";
    }
    public static void main(String[] args) {
        String str = "12312";
        change(str);
        System.out.println(str);

    }
}

enum Color {
    RED("红色");
    private String title;

    Color(String title) {
        this.title = title;
    }

    @Override
    public String toString() {
        return this.title;
    }
}
